Hydraulic-pressure regulator



(No Model.) 2 Sheets-Shea: I. F. R. FRENCH.

HYDRAULIC PRBSSP'RE REGULATOR- No. 586,598. Patented July 20, 1897.

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P. R. FRENCH. HYDRAULIC PRESSURE REGULATOR.

9 8 I h w l w h '0' I m m T1 L QQI w 4 5,E. 6 E w fi m wil mwm v e 2 MM UNIT D STATES PATENT OFFICE.

FREDERICK R. FRENCH, or NIAGARA FALLSQNEW YoEK.

' HYDRAULlC-PRESSU RE REGULATOR.

SPECIFICATION forming part of Letters latent N6. 586,598, dated July 20, 1897.

Application filed March 11, 1897.

sure Regulators for Pulp-Grinders in Paper-- Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a new and useful improvement in hydraulic-pressure regulators for pulp-grinders in paper-mills; and it consists in the construction and arrangement of parts hereinafter described, and definitely pointed out in the claims.

The aim or purpose of this invention is to construct a regulator in the water-supply system to the hydraulic-pressure cylinders of the pulp-grinder which will maintain a constant pressure in the system and cylinders. It is also the purpose to construct a regulator wherein the water will be allowed to gradually return to the suction of the pump when the pressure tends to become too great, thus preventing the pressure exceeding the required intensity. r

A further object is to construct the regulator to act as .an accumulator. to store water I which will he] the pump when a large amount 7 of pressure-water is needed in the cylinders.

This invention also contemplates the use of a system constructed with suitable pipes and valves wherein a pump operating at a variable speed and of small capacity can supply" a large amount of pressure-water to the cylinders at intermittent periods and to maintain an evempressure and with small cost.

These and other objects not hereinbefore mentioned are accomplished by the construction illustrated in the accompanying drawings, wherein like letters of reference indicate corresponding parts in the several views and in which- 7 Figure 1 is an elevation of the pulp-mill, Water-supply system, and preferred form of mg ulator constructed and arrapged in accordance with myinv'ention. Fig. 2 isasectional detail view taken at a point indicated by the line 2' 2, Fig. 3, illustrating the construction Serial No. 626,976. (No model.)

of the upper end of the pressure-reservoir.

Fig. 3 is a like view taken'ata point indicated by the line 3 3, Fig. 2. Fig. 4 is a sectional plan view of the same, taken at-a point indicated by the line 4 4, Fig. 2. Fig. 5 is a view similar to that shown in Fig. 2, illustrating a modification; and Fig. 6 is a plan view of the construction shown in Fig. 5.

In the drawings, A designates a casing in which is supportedthe grinding-shaft A of the grinder.

A designates a suitable foundation for the casing.

l3 designates the wood-pockets, in which is placed the Wood to be ground into pulp.

C designates the hydraulic-- pressure cylinders for forcing the wood onto the grinder. The cylinders, wood-pockets, and grinder are of the usual and well-known construction of grinding-mills.

D designates a fan-pump for supplying water under pressure to the hydraulic-pressure cylinders O.

v E designates a water-tank which is connect: ed to the suction of the pump by the pipe D. The pipe D isprovided with a valve E for a purpose hereinafter described.

F designates a pipe leading from the pump. This pipe is provided with suitable elbows F and lead from the pump to the grinding-mill.

F is a check-valvein the pipe for -a purpose hereinafter described.

F designates a supply-pipe for the pressure-cylinders leading to the cylinders from the pipe F.

G designates pipes leading from the supplypipeto the interior of the cylinders, which are controlled by suitable valves G.

G designates discharge-pipes from the cylinders. The pump, supply-pipes, valves,

and discharge-pipes are of the ordinary construction used in supply systemsTfor grindiug-inills; 1

G designates a dividing wall between the pump and grinding-mills In pulp-grinding machines it has been found necessary to maintain an even and constant pressure in' the pressure-cylinders to produce the best results. If there is not an even pressure between the wood and stone of the grinder an unevenand undesirable pulp is produced. 19 order to produce this result roe ' h, secured in place by the bolts h.

and at the same time to allow the pump to run at an even rate of speed, I interpose between the pump and grinding-mill a pressure-reservoir H, as shown in Fig. 1. This pressure-reservoir'is in the form of a vertically -disposed cylinder located above .the pipe F, and is connected to the said pipe by means of the pipe II, leading into the bottom of the reservoir, and the T-coupling II in the pipe F. Located above the reservoir is a weight 1, adapted to slide in suitable guides I, which are supported from the platform I, secured to the dividing-wall G'.

Depending from the weight I is a pistonrod which passes through the top of the cylinder and. is connected to a piston J within the reservoir, as plainly shown in Figs. 2 and 3. The reservoir is provided with a suitable head The head is provided with a packing-nut h, through which the piston-rod passes. K is a returnpipe leading from the top of the reservoir back to the supply-tank for the pump.

It will be seen that the piston J fits closely within the reservoir and that water cannot pass above the piston. The upper portion of the reservoir is provided with the oppositely-arranged escape-ports L, which are formed by providing the reservoir with the enlargements L, as plainly shown in Fig. 4. These escape-ports connect with the returnpipe K. I

By referring to Figs. 2 and 4 it will be seen that the enlargements L, forming the ports L, are formed with the inclined and tapered back I and the inclined and tapered sides Z, and that the back and sides taper downward and incline inward from the top and meet at their'lower end, forming a contracted portion at the polnt Z as shown 1n 1 1g. 3, forming a V-shaped port having the downwardly-inclined and tapered sides and back.

It will be noticed by referring to Fig. 2

that when the piston is at the top of the reservoir Water can escape from the reservoir through the escape-ports and returnpipe K back to the tank E.

The intensity of pressure required in the system is regulated by the amount of weight supported by the piston in the reservoir.

- In operation the pump is started, and when the pressure in the. system is sufficient to raise the piston and weight the piston will continue to rise until it reaches the escapeports, when the water under pressure will escape back to the tank E through the return-pipe K. By forming the escape-ports V-shaped with the downwardly and inwardly inclined tapered sides and back forming the contracted lower portion the area of exhaust will increase slowly and uniformly with the ascent of the piston, allowing the water to escape very gradually, thus avoiding any sudden escape of the water, which would cause variationin the pressure and'allowing the piston to rise evenly in the cylinder with-' out binding. As before stated, the

water is returned back to the tank E and the suction to the pump is regulatedv by the valve E in the pipe D to allow the minimum amount of .waterto be pumped into the system. After the system has been in operation a short time "the valve canbe so adjusted that scarcely any water will escape from the reservoir.

At times of large demand on the pressurewater the piston, with its weight, descends and forces the water in the cylinder into the system to assist the pump maintain the pressure. hen the demand is not so great, the pump forces water into the cylinder, raising the weight, thus storing energy to be used at times of large demand. My regulator as constructed is especially useful to maintain an even pressure when the power driving the pump is variable in speed.

While I have shown my pressure-reservoir adapted to work with an upward and downward pressure, it is obvious that the regulator could be made to work with a downward or upward pressure separately. It is also obvious that I could substitute a plunger-pump, as would be necessary with high pressures, or pumps of any construction in lieu of the fanpump shown. The water stored in the pressure-reservoir is prevented from returning to the pump by means of the check-valve F.

While I have shown but one grinding-mill, it is evident that the pump cansupply waterpressure for any nu mber, and I therefore show the supply-pipe F extending beyond the grinding-mill shown and the supply-pipe 15" provided with a valve f for shutting oif the grinding-mill from the pressure-water supply.

In Figs. 5 and 6 I show a modification of the pressure-reservoir, exhaust-ports and return-pipe. In the modification'I provide the pressure-reservoir with a series of exhaustports L, which are staggered around the side of the reservoir. Each one of these exhaustports is connected to the return-pipe K by means of the connecting-pipes K. The exhaust-ports L are provided with the downwardly and inwardly extending tapering portions, as shown in Fig. 5, which will allow a gradual opening of the exhaust-ports when the piston rises. By staggering the ports, it will be seen that each port will be opened only when the piston raises above the port, so that a very even pressure can be obtained in the system. I

While I have shown my regulator applied to a wood-grinding ,mill'for paper manufacture, it is evident that it could be used in any pressure-water system for hydraulic cylinders or presses. It is also obvious that many minor changes can be made in the construction and arrangements of parts without in the least departing fromthe principles and nature of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters .Patent, is-

the pressure becomes too pipe leading-from the pressure-reservoir to the source of supply for'the pump, a Weighted H 5 piston in the reservoir normally closing the return-pipe and adapted to be actuated by the pressure in the systemfor opening the returnpipe and allowing the water to escape from the reservoir'back to the source of supply when great, substantially as described.

2. The combination with a pressure-supply system for hydraulic presses, ofa pressurereservoir interposed between the press and pump-supply and connected tothe system, a

return-pipe leadingfrom the pressure-reservoir to the pump-supply, a Weighted piston in'the reservoir normally closing the returnpipe and adapted to be actuated by the pressure in the system for opening the return-pipe andallowing the water to escape from the reservoir back to the pump when the pressure,

. becomes too great, and a valve interposed between the pump-supply and pump for regu- 2 5 lating the supply to the pump, substantially as described.

, The combination with a pressure-watersupply system for hydraulic presses, of a pressure-reservoir interposed between the press. and pump and connected to the system and p rovided with oppositely-arranged ports, a return-pipe leading from the ports to the source of supplyfor the pumps and a weighted piston in the reservoir normally closingthe ports and adapted to be actuated by the pressure in the system to open the ports when the pressure becomes too great, substantially as described.

4. In a pressure-regulatorJhe combination 40 with a pressure-Water-supply system for hydraulic presses, of a pump for supplying the system, a tank connected to the suction of the pump, a valve interposed between the suction of the pump and tank, a pressure-reservoir in 5 terposed between the press and pump,a checkvalve in the system between the pressure-res ervoir and pump, a return-pipe leading trom the pressuredeservoir to the tank, and a weighted piston in the reservoir adapted. to

be actuated by the pressure in the system and controlling the outlet of the water from the pressure-reservoir through the return-pipe to the tank, substantially as described.

5. The combination with a pressure-water- '5 5 supply system for hydraulic presses, of a pressure-reservoir interposed between the press and source of supply and connected to the system and provided with a port having inclined sides forming a. contracted portion, a

return-pipe leading from the port to the source of supply and a weighted piston in the reservoir controlled by the Water-pressure for open ing and closing the port and adapted to slide over the contracted portion of the port first when opening the port, substantially as described.

6. The combination with a pressure-watersupply system for hydraulic presses, .of a pressure-reservoir interposed between the press and source of supply and connected to the system, a return-pipe leading from the pressure-reservoir to the source of supply, a port having a tapered side connecting the returnpipe to the reservoir, and a weighted piston in the reservoir controlled by the water-pressure for opening and closing the port and adapted to slide overthe tapering portion of the port first when opening the port, substantially as described.

7. The combination with a pressure-watersupply system for hydraulic presses, of a pressure-reservoir interposed between the press and source of supply and connected to the system at its-lower end, a return-pipe leading from the top of the reservoir to the source of supply, a port in the reservoir adjacent the top thereof connecting the return-pipe to the reservoir, normally below the port and closingthe same and a weighted piston in the reser voir adapted to be raised bythe water-presnormally below the port and adapted to be raised above the port when the pressure becomes too great, substantially as described.

9. The combination with a pressure-watersupply system for hydraulic presses, of a pressure-reservoir interposed between the press and source of supply and connected to the system and provided with a port having'taperinginclined sides and back forming a coin tractedportion, a return-pipe leading from the port to the source of supply and a weighted piston inthe reservoir controlled by the waterpressure for opening and closing the port and adapted to slide over the contracted portion of the port first when opening the port, substantially as described.

In testimony whereof I affix my signature in presenceof two witnesses. 

